Monthly revenue from U.S. online prostitution advertising exceeded $5 million for the first time in March.

The March total of $5.1 million on five tracked websites was 4.2 percent higher than the February total and 61.1 percent higher than March 2012. The large year-over-year gain is due to recent increases in the prices of escort and body-rub listings on Backpage.com.

The monthly total is m

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